Rails 3.1 - Confoo

Another new version of Rails. Delightful. And terrifying. What's changed this time? Fear Not!

We'll be reviewing the changes and additions to Rails 3.1, giving you a walk-through of what it all means (asset pipeline, what?), in the context of a brand new app, and an older app that will need to be upgraded.

Transcript

1. Rails 3.1
   Lori Olson
   Confoo 2012
   Montreal, QC
   

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2. Another new version of Rails.
   Delightful. And terrifying.
   What's changed this time?
   

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3. Summary
   • jQuery
   • CoffeeScript
   • SASS
   • Asset Pipeline
   • Miscellaneous cool stuff
   

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4. But...
   • What about Rails 3.2?
   • only released a few weeks ago
   • not nearly as many scary changes
   

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5. jQuery
   

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6. • How to go back to Prototype (not
   recommended
   • rails new my_app -j prototype
   What you HAVE to know
   

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7. Differences
   • Gemfile
   gem ‘jquery-rails’
   • application.js
   //= require jquery
   //= require jquery_ujs
   

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8. But... Why jQuery?
   

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10. CoffeeScript
    

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11. • Nothing
    • Absolutely not required
    • Just remove one line from Gemfile
    • gem 'coffee-rails'
    • And you don’t even have to do this
    What you HAVE to know
    

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12. Thomas Fuchs on
    CoffeeScript
    • May 2011 - "I just like javascript too
    much to have a use for that, but I
    understand why other people might
    like it"
    • Aug 2011 - There, it happened.
    Mistakenly typed CoffeeScript in a .js
    file. So easy to pick up, and so natural.
    

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13. CoffeeScript Resources
    • Railscasts
    • CoffeeScript Basics
    • http://railscasts.com/episodes/267-coffeescript-basics
    • Peepcode
    • Meet CoffeeScript
    • http://peepcode.com/products/coffeescript
    • Books
    • Pragmatic Programmers - CoffeeScript
    • O’Reilly - The Little Book on CoffeeScript
    

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14. SASS
    

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15. • Nothing
    • Absolutely not required
    • Just remove one line from your Gemfile
    • gem 'sass-rails'
    • And you don’t even have to do that
    What you HAVE to know
    

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16. Is it SASS or SCSS?
    • Sass is the older style HAML-like
    indented syntax
    • SCSS is the new main syntax, which is a
    superset of CSS3
    

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17. Why SASS?
    • Variables
    • Nesting
    • DRY up your styles
    • Mixins
    • reusable chunks
    • with arguments!
    • Selector Inheritance
    

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18. Alternatives to SASS
    • Less
    • HSS
    • Other, technology specific
    • XCSS (PHP)
    • CleverCss (Python)
    • CSS Crush (PHP)
    

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19. Asset Pipeline
    

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20. assets dir
    

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21. js manifest
    • Powered by - Sprockets
    • application.js
    // FIXME: Tell people that this is a manifest
    file, real code should go into discrete files
    //
    //= require jquery
    //= require jquery_ujs
    //= require_tree .
    

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22. SASS - no sprockets
    • probably don’t want to use manifests
    • use @import, or your variables and
    scopes will not work
    

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23. Dev vs Production
    • To precompile, or not to precompile
    • Heroku
    • Cedar stack
    • counter-intuitive settings
    

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24. Compression
    • Uglifier (for javascript)
    • SCSS (for css)
    

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25. But, Why?
    

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26. Identity Map
    

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27. • application.rb
    # Enable IdentityMap for Active Record,
    to disable set to false or remove the line
    below.
    config.active_record.identity_map = true
    enabling
    

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28. problems
    • associations
    • STI
    • tests
    

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29. nested
    has_many :through
    

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30. class Project < ActiveRecord::Base
    has_many :tasks
    has_many :assignments, :through => :tasks
    has_many :users, :through => :assignments
    end
    

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31. Migrations
    

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32. class CreateProjects < ActiveRecord::Migration
    def change
    create_table :projects do |t|
    t.string :name
    t.timestamps
    end
    end
    end
    

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33. HTTP Streaming
    

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34. requirements
    • Ruby 1.9.2 (min)
    • Web server support
    • nginx
    • unicorn
    

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35. Examples
    

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36. New App
    

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37. Upgrade
    

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38. Bundler
    • Did you know... you can use bundler all
    the way down to Rails 2.1 apps?
    

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39. • http://youtu.be/7UzGdqaDnp8
    Add Bundler
    

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40. • Upgrade the Gemfile
    • Config file changes
    • Move the assets
    

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41. Configs
    • boot.rb
    • config.rb
    • development.rb
    • production.rb
    

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42. Assets
    • Move asset folders
    • Fix image references
    • Manifests
    • stylesheet and javascript tag references
    

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43. • Upgrading a Rails 2.1 app to Rails 3.1 in
    1…
    Upgrade Demo
    

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